Depending on the drive train you might have to come up with some cutoms changes to the trans crossmember as well. I am swapping my 79 frame for a 84 frame and I have sound quite a few changes between the two frames. Especially the crossmember. Like Alex211 stated plan on buying front springs as well since teh width is different between the two frames.
1979 CJ7 aka "Christine" Build Thread: [url]http://www.jeepforum.com/forum/f8/bigredisbs-1979-cj7-build-1025854/[/url]
2013 Rubicon Unlimited build thread:[url]http://www.jeepforum.com/forum/f96/bigredisbs-jkur-build-1456541/#post14700472[/url]